What is Maca Red?

Maca is the swollen root (a hypocotyl) of Lepidium meyenii, a cruciferous plant related to radish and mustard that grows above 4,000 metres in the Peruvian Andes. Andean farmers have cultivated it for centuries as a food crop — dried, boiled and eaten as porridge, flour or fermented drink — and it carries a long folk reputation as a fertility and stamina food for both people and livestock.

Maca roots come in several natural colours: cream or yellow (the most common), black, purple, and red. Red maca is the phenotype with high anthocyanin content in the skin and flesh. Farmers have long sorted roots by colour, but the idea that each colour has a distinct clinical action is a much newer framing, driven largely by a research group in Lima and then amplified by the supplement trade.

What is genuinely established is thin. Red maca performed well in rodent studies of prostate enlargement and of bone loss after ovary removal, and it has the highest antioxidant pigment content of the colours. Human trials, however, have overwhelmingly used yellow or unspecified maca. So when red maca is sold specifically for "female hormonal balance" or bone density, that positioning is extrapolated from animal work and from general maca trials, not from trials of red maca in women.

How does Maca Red work?

Maca does not appear to be a phytoestrogen and does not reliably change measured oestrogen, FSH, LH or testosterone in human trials — this is one of the more consistent findings, and it argues against the common "hormone balancing" explanation. The more plausible mechanisms are central rather than endocrine: macamides are fatty acid amides that inhibit fatty acid amide hydrolase and so may raise endocannabinoid tone, which could explain effects on mood, appetite and libido. Glucosinolates break down to benzyl isothiocyanate, which has activity in prostate tissue in laboratory models. The red pigments are anthocyanins with straightforward antioxidant behaviour. In short, if maca helps menopausal symptoms it is more likely acting on mood and autonomic symptoms than on hormone levels themselves.

What forms does Maca Red come in?

Raw dried powder is closest to the traditional crop but not to traditional practice — Andean use almost always involves cooking or fermenting the root first, and raw powder is the form most likely to cause bloating and gas. Gelatinised powder has been heat-treated to break down starch; it is easier on the gut and is what most supplement trials that specify a form have used. Capsules are simply powder in a shell and require a lot of capsules to reach the doses used in studies (2–3 g/day). Extracts vary wildly and are rarely standardised to macamide content, so potency is unpredictable. For red maca specifically, check that the label states the colour and its percentage — many products labelled "red" are colour-blended.

Where it comes from:

Maca has been cultivated on the Junín plateau for at least 2,000 years and appears in colonial Spanish records as a crop the Andean population used for fertility and endurance at altitude. It was primarily a food, eaten boiled or as a fermented drink called maca chicha, rather than a dispensed medicine, which is why it does not sit in a codified formula tradition the way Chinese or Ayurvedic herbs do. Colour sorting is traditional. The pharmacological separation of red, black and yellow maca dates from research published in the 2000s, and the international red-maca-for-women market is younger still.

What does Maca Red help with?

Maca is a root crop that grows high in the Andes of Peru. People there eat it as a food and use it as a folk tonic. Red maca is the red-pigmented type of the same root.

• Low sex drive
  Early evidence — a few small placebo-controlled trials, colour of maca usually not stated. Placebo-controlled trials in healthy men and in postmenopausal women reported more self-reported desire after 6 to 12 weeks. The trials were small. Desire shifted more than arousal or physical function, and testosterone and oestrogen did not change.
  Evidence grade C · Traditional tier T2
• Hot flushes, night sweats and low mood at menopause
  Early evidence — several small randomised placebo-controlled trials, mostly under 30 women each. These trials ran 6 to 12 weeks, mostly with fewer than 30 women each. Symptom scores dropped more than with placebo, and mood items shifted most. Oestrogen, FSH and LH did not change, so the effect does not look hormonal.
  Evidence grade C · Traditional tier T2
• Low mood and anxiety around the change of life
  Early evidence — small short trials in postmenopausal women, not repeated at scale. Small trials reported lower anxiety and depression subscale scores with maca than with placebo. None of them used proper diagnostic rules for depression. One untested idea is that maca compounds called macamides act on the body's own cannabis-like signals in the brain.
  Evidence grade C · Traditional tier T2
• Sexual side effects from antidepressants
  Early evidence — one small crossover trial in adults taking SSRIs, not repeated. In that trial, a higher maca dose raised sexual function scores more than a lower dose. The shift was clearer in women. There was no true placebo arm, and no one has repeated the result.
  Evidence grade C · Traditional tier T2
• Low energy, stamina and everyday tiredness
  Long traditional use · not yet tested in trials — one small cycling trial plus null studies, against long Andean food use. One small cycling trial reported faster time-trial performance. Other studies found no real change. Maca holds no caffeine, and no mechanism for a stimulant effect is known, so this claim is mostly traditional.
  Evidence grade D · Traditional tier T2
• Male fertility and sperm quality
  Long traditional use · not yet tested in trials — small, mostly uncontrolled human studies, and they used yellow or black maca. Small studies in men reported more semen volume, higher sperm counts and better motility after several weeks. Reproductive hormones did not change. In animal work, sperm effects track with black maca rather than red.
  Evidence grade D · Traditional tier T2
• Bone strength after menopause
  Long traditional use · not yet tested in trials — rat studies only. In rats with the ovaries removed, red maca slowed bone loss compared with controls. That work ran for weeks at doses that do not map onto people. No human trial has measured bone mineral density with red maca.
  Evidence grade insufficient · Traditional tier T2
• An enlarged prostate and its urinary symptoms
  Long traditional use · not yet tested in trials — rat studies only. Rats were given testosterone to swell the prostate. Red maca lowered prostate weight, while yellow and black maca did not. Benzyl isothiocyanate is the suspected active compound, and there is no adequate human trial.
  Evidence grade insufficient · Traditional tier T2

What Maca Red has not been shown to do

• No human trial shows that red maca keeps bone density up after menopause; that finding comes from rats.
• No human trial shows that red maca eases an enlarged prostate or its urinary symptoms.
• Trials did not find changes in oestrogen, FSH, LH or testosterone, so maca has not been shown to act as hormone therapy.
• It has not been shown to treat clinical depression or an anxiety disorder, and no trial used proper diagnostic rules.
• Female fertility claims rest on tradition alone, with no adequate human trials.
• Red maca has not been shown to improve sperm measures; animal work links those effects to black maca.
• Maca has not been shown to work as a stimulant, and it holds no caffeine.
• It has not been shown to stand in for calcium, vitamin D, weight-bearing exercise or prescribed bone medicine.

How to read this:

These grades rate the human evidence for each single use, not the strength of the root. A means many matching trials in people. B means one good trial. C means small, mixed or early human studies. D means the human results are weak or clash. Insufficient means no human study at all, so only lab work, animal work or custom. This page reports what studies found, and lists options. It is not advice and not a plan of care. New or lasting symptoms, tiredness, low mood, trouble passing urine or trouble conceiving all need a clinician. Do not lower or stop an antidepressant or a bone medicine to try maca.

What can Maca Red help prevent?

• Nothing is established. Red maca has not been shown in human studies to prevent osteoporosis, prostate enlargement, infertility or any other condition — the bone and prostate prevention claims attached to red maca come from rodent experiments.

Which foods are rich in Maca Red?

Red maca is itself a food, and in Peru it is eaten as boiled root, flour in porridge and bread, or fermented into a drink — cooked, not raw, which is worth knowing given how much maca is sold as raw powder. Around menopause and for bone health, the food changes with real evidence behind them are unglamorous: adequate calcium (dairy, tinned sardines with bones, fortified plant milks, tofu set with calcium), enough vitamin D, and enough protein spread across the day to protect muscle. Soy foods (tempeh, tofu, edamame) contain isoflavones with their own modest evidence for hot flushes, and are a better-studied dietary lever than maca. Oily fish, legumes and leafy greens support the same general picture. Foods to limit: alcohol and spicy foods are common hot-flush triggers for individual women, and heavy alcohol intake independently accelerates bone loss; excess caffeine can worsen sleep disruption that is already fragile in the menopausal transition.

What are the side effects of Maca Red?

• Bloating, gas and abdominal discomfort: most common with raw (non-gelatinised) powder
• Loose stools at higher intakes
• Feeling wired, restless or having trouble sleeping if taken late in the day
• Headache in a minority of users during the first week
• Goitrogenic potential from glucosinolates: theoretically relevant with iodine deficiency or existing thyroid disease, particularly with large amounts of raw root
• Rare reports of palpitations or increased heart rate
• Unpleasant earthy, malty taste that many people find hard to tolerate in powder form

Good to know:

Maca is eaten as an ordinary food in Peru and is generally regarded as safe at supplement doses in healthy adults for up to about three months. Most complaints are digestive and improve with a gelatinised product or a lower dose. Safety in pregnancy, breastfeeding and childhood at supplement doses has not been studied, so food-level intake only is the cautious position there.

How much Maca Red should you take?

• Recommended daily: Typical supplement use is 1.5–3 g/day of dried root powder (raw or gelatinised), which matches the 2–3.5 g/day range used in most maca trials. As a food in the Andes, considerably larger amounts of cooked root are eaten. Capsules are usually 500 mg, so trial-level dosing means 3–6 capsules a day. Extracts are not standardised and cannot be reliably converted to powder equivalents.
• Best time of day: Morning or early afternoon. Some users find it activating and prefer to avoid it late in the evening; there is no formal evidence on timing.
• With or without food: With food. Maca is a starchy root and sits better in the stomach with a meal; gelatinised powder is easier to tolerate than raw if you get bloating.
• Time to effect: Most reported effects build over 2–6 weeks. Menopause trials measured outcomes at 6–12 weeks. Nothing about maca is expected to work on the first day.
• How long to take it: Trials have run up to about 12 weeks; long-term safety data beyond that is limited, though maca has a long history as a dietary staple. A reasonable approach is a 12-week trial, then an honest assessment of whether anything has actually changed before continuing.